Means for opening and closing doors.



7 mmwm A. HUHNE & HIKRAKE. MEANS FOR OPENING AND CLOSING DOORS}APPLICATION FILED AUG. 5, 1913.

Patentd Feb. 23, 1915.

2 SHEETS-SHEET 1- A. H'O'HNE & H. KRAKE.

MEANS FOR OPENING AND CLOSING DOORS.

APPLICATION FILED AUG. 5, 1913.

2 SHEETS-SHEET Z.

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. i n Aplillcaitldn filed Aust 5, 1913. serial Ito. 7%,100.

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Be it known that we, ARNo Her-1m: and

. HERMANN KRAKE, subjects of the Emperor of Germany, residing atWaldstrasse 51,

Leipzig, Germany, and Wiesenstrasse 4 13,v

Leipzig, Germany, respectively, have invented certain new and usefulImprovements in or Relating to Means for Opening and Closing Doors, ofwhich the following is a specification.

The object of the present inventlon is to preclude the difliculty nowexperiencedin electrically opening doors of having the door close beforethe return of the opening apparatus to its initial position whereby thewhole mechanism is strained and sometimes rendered inoperative.

An embodiment of the invention is illustrated by way of example in theaccompanying drawing, in which:

Figure 1 is an elevation showing the door closed, the circuit open andthe mechanism in its normal position. Fig. 2 is a corresponding planview of the operating mechanism. Figs. 3 to 5 illustrate the mechamsmcorresponding to various positions of the door.

' The shaft 1) rigidly connected with the door a carries a clutchelement a at its lower end, and the entire door operating device isarranged in arecess located beneath the door (Fig. 1). The solid coneengaged in 'the clutch element a which is formed as a hollow cone isconnected with a gear wheel (I loosely mounted on the shaft 1) andmeshing with a toothed sector e rotatably mounted about a pivot w. Thesector is provided with a horizontally extending arm 1 having an arcshaped slot in which engages a crank pin f fixed to a worm wheel 9driven by the motor 12. by means of a worm n. Upon the under side of theworm wheel 9 a disk 0 is secured thereto and this disk has formed in itsperiphery a recess a in which the curved or ben end of an arm p fixed tothe element a of t e door engages when the door is closed. The motor 71,is of ordinary construction and is so arranged that it is in cmcuit whenthe latch of the lock in the door is lifted or open andout of circuitwhen the latch is closed. A resistance g serves to regulate the speed ofthe electric motor 71..

The operation is as follows: When the door latch is lifted or opened theelectric circuit is closed and the electric motor becomes operative. Theworm n driven by the :nrotor rotates the worm 'w'lieel g and itsdisplaces the slotted arm in the direction indicated by the arrow (Fig.3), its movement being transmitted to the shaft b through the toothedsector e, gear wheel (1 and the clutch c in such a manner that the,

door isppened and the curved end of the arm 39 is lifted out of therecess a in the dlsk 0. When the door has swung outward through 90 thecrank pin f moves idly or moperatively for a certain distance in theslot of the arm 3 and during this time the door remains open (Fig. 4).If it should be desired to close the door immediately after it has beenopened, the yielding clutch would permit of it, but the door could notbe completely closed because-the inwardly displaced end of the arm ;0fixed to the element e of the door bears against the periphery of thedisk 0 and prevents the door from closlng, far enough to lock, until theoperative elements have again approximately reached their initialpositions 5) During the last part of movement of the operative elementsthe arm p comes into operation owing to the recess 2 coming opposite 1twhereby complete closing of the door by the mechanism is renderedpossible, the latch breaking the circuit and the motor and the operativeparts connected therewith being brought to rest. a

The arrangements described present the advantage that when the apparatusis operating normally the door remains open for a certain period,thereby facilitating the passage of bicycles, perambulators and thelike, while in the second place the normal operation of the devicecannot be disturbed.

What we claim and desire to secure by Letters Patent is 1. A device ofthe class described comprising a door, a motor for opening and closingthe same, operating connections between the motor and door, means forholding said door. open a predetermined period of time comprising an armfixed to the door and a cam shaped body secured to said operatingconnections and acting upon said arm when the door is closing but whichprevents the complete closing of the door until the operatingconnections have returned to their initial door opening position,substantially as described.

'2. A device for opening and closing doors comprising an electric motor,a gear wheel driven thereby, a crank pin on said wheel,

a slotted member in which said crank pin- In testimony whereof we haveaffixed our engages, a toothed wheel rotated by said signatures inpresence of two witnesses. slotted member and a. pivot for the door ARNOHOHNE rotated by said gear wheel, and a, cam disk 5 secured to said gearwheel and an arm se- HERMANN KRAKE' cured to the pivot at one end andengaging Witnesses:

against the cam disk at its other end, sub- RUDOLPH Fizicxn, stantiallyasset forth. o I Mom'rz SPEER.

